Sigara (Subsigara) cf. falleni (Fieber, 1848)

Berchi, Gavril Marius, Rădac, Ioan Alexandru, Boda, Pál & Kment, Petr, 2024, Water boatmen (Heteroptera: Nepomorpha: Corixidae) of Romania, Zootaxa 5555 (2), pp. 227-252 : 242

Sigara (Subsigara) cf. falleni (Fieber, 1848)

( Figs. 23, 25 )

Material examined. ROMANIA: Harghita County: Sânpaul [pond], 46.1879°N 25.387°E, 482 m a.s.l., 13.viii.2023, 1 ♂ .

Remarks. The examined specimen is possibly a hybrid with an intermediate shape of the pala ( Fig. 25 ) between typical S. falleni (triangular, Fig. 24 ) and S. iactans (trapezoidal, Fig. 26 ). Similar specimens were also recorded in the central-north European populations of S. falleni and S. iactans by Jansson (1983, Fig. 1 ) and Bryja & Kment (2001, Fig. 3 ). Havemann et al. (2018) failed to recover the two taxa as monophyletic in study using COI barcode fragments and also suggested ongoing hybridization. This record is marked with a question mark in Fig. 23 .

Figures

FIGURE 1. Boxplots representing the elevational distribution of Corixidae in Romania. Circles represent outliers, asterisks represent extreme values. Colors indicate different genera (i.e., red = Cymatia Flor, 1860; black = Glaenocorisa Thomson, 1869 (single record); purple = Arctocorisa Wallengren, 1894; gray = Callicorixa White, 1873; yellow = Corixa Geoffroy, 1762; green = Hesperocorixa Kirkaldy, 1908; dark blue = Paracorixa Fieber, 1848; light blue = Sigara Fabricius, 1775).

FIGURES 22–28. (22–23) Distribution in Romania: (22) Sigara (Sigara) striata (Linnaeus, 1758); (23) Sigara (Subsigara) falleni (Fieber, 1848) (dots) and S. (Subsigara) iactans Jansson, 1983 (squares). (24–26) Shape of the male pala: (24) Triangular pala—S. (Subsigara) falleni (Romania:Sibiu county: Săcel); (25) Intermediate between triangular and trapezoidalpala (Romania: Harghita county: Sânpaul); (26) Trapezoidal pala—S. (Subsigara) iactans (Romania: Dolj county: Ciupercenii Noi). (27–28) Distribution in Romania: (27) Sigara (Subsigara) fossarum (Leach, 1817); (28) S. (Vermicorixa) lateralis (Leach, 1817). Blank shapes represent published records, solid shapes represent records from this study, and question mark in Fig. 23 indicates the location of the specimen with an intermediate shape of the pala [listed as Sigara (Subsigara) cf. falleni]. Palae not scaled.

FIGURES 2–7. (2–3) Distribution in Romania: (2) Cymatia bonsdorffii (Sahlberg, 1819) (dot) and C. coleoptrata (Fabricius, 1777) (squares); (3) Cymatia rogenhoferi (Fieber, 1864). (4–6) Habitus of: (4) Cymatia bonsdorffii (Czech Republic: Moravia: Křižánky); (5) C. coleoptrata (Czech Republic: Bohemia: Lhotka); (6) C. rogenhoferi (Czech Republic: Moravia: Valtice- Úvaly). (7) Distribution of Glaenocorisa propinqua (Fieber, 1860) (dot), Arctocorisa carinata carinata (Sahlberg, 1819) (squares), and Callicorixa praeusta praeusta (Fieber, 1848) (triangles) in Romania. Blank shapes represent published records, while solid shapes represent records from this study. Blue scale for habitus: 1 mm.